WO2024208111A1

WO2024208111A1 - Motor and motor assembly

Info

Publication number: WO2024208111A1
Application number: PCT/CN2024/084986
Authority: WO
Inventors: 喻泽文; 王东雄; 王颖
Original assignee: 东风汽车集团股份有限公司
Priority date: 2023-04-07
Filing date: 2024-03-29
Publication date: 2024-10-10
Also published as: CN116488387A

Abstract

The present application relates to the technical field of motors, and in particular, to a motor and a motor assembly. The motor comprises a housing, a stator assembly, and a rotor assembly. The housing is formed with a cooling chamber and an accommodating chamber that are mutually independent. The cooling chamber is configured for circulating a cooling liquid. The stator assembly is located in the cooling chamber, and the rotor assembly is rotatably arranged in the accommodating chamber.

Description

Motors and Motor Components

This application claims priority to Chinese patent application No. 202310371042.5 filed on April 7, 2023, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the technical field of motors, and in particular to a motor and a motor component.

Background Art

In the related art, the stator assembly of the motor generates heat during operation, causing the temperature of the stator assembly to rise. However, in the prior art, the stator assembly has the problem of being difficult to dissipate heat in time, causing the temperature of the stator assembly to accumulate, which can easily burn the motor in serious cases.

Technical issues

In view of this, embodiments of the present application hope to provide a motor and a motor assembly that can improve the cooling uniformity of the stator assembly.

Technical Solutions

In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

The present application discloses a motor, including:

The housing is formed with a cooling cavity and a receiving cavity which are independent of each other, and the cooling cavity is configured to flow a coolant;

A stator assembly is located in the cooling cavity;

The rotor assembly is rotatably disposed in the accommodating cavity.

In one embodiment, the cooling cavity surrounds the outer circumference of the accommodating cavity.

In one embodiment, the stator assembly includes a stator core and a stator winding. The stator core is formed with winding slots penetrating through both end surfaces along the axial direction, and a portion of the stator winding is disposed in the winding slots.

In one embodiment, the inner circumference of the stator core abuts against the inner circumference of the cooling cavity, the outer circumference of the stator core abuts against the outer circumference of the cooling cavity, and the outer circumference of the stator core is formed with liquid passing grooves penetrating its two axial end surfaces.

In one embodiment, the motor includes a cooling channel configured to flow a coolant, wherein the cooling channel passes through opposite ends of the rotor assembly.

In one embodiment, the rotor assembly includes a rotating shaft and a rotor core, wherein the rotor core is sleeved on the rotating shaft, and the rotor core is formed with weight-reducing through holes penetrating both axial end surfaces thereof, and the weight-reducing through holes are part of the cooling channel.

In one embodiment, the rotor assembly includes two end plates, which are sleeved outside the rotating shaft and respectively abut against two axial end faces of the rotor core. A liquid guide groove is formed on at least one of the opposite end faces of the end plate and the rotor core, and the liquid guide groove is a part of the cooling channel. The weight-reducing through hole connects the two liquid guide grooves located on both sides of the axial direction thereof.

In one embodiment, the rotating shaft has two shaft ends located at two ends of the rotor core along the axial direction, and the shaft ends are formed with flow holes, and the flow holes are connected to the liquid guide groove on the side where the shaft ends are located.

In one embodiment, the rotor assembly includes a magnetic steel, a magnetic steel groove is formed on the rotor core, the magnetic steel is arranged in the magnetic steel groove, and the magnetic steel groove is connected to the liquid guide groove.

In one embodiment, the housing is formed with a liquid inlet, a first branch and a second branch, the first branch connects the liquid inlet and the cooling cavity, and the second branch connects the liquid inlet and the cooling channel.

Another aspect of the present application discloses a motor assembly, including:

The motor in any one of the above embodiments;

The reducer comprises a reducer housing, wherein the reducer housing is a part of the housing.

In one embodiment, the housing includes a motor housing and a motor end cover, the motor housing is formed with a first bin and a second bin that are independent of each other, both ends of the first bin and the second bin are open in the axial direction, and the reducer housing and the motor end cover are respectively located at the two ends of the motor housing in the axial direction;

The reducer housing and the motor end cover close the openings at both ends of the first chamber along the axial direction to jointly define the cooling cavity;

The reducer housing and the motor end cover close the openings at both ends of the second chamber along the axial direction to jointly define the accommodating cavity.

In one embodiment, the reducer housing is formed with a liquid supply port, a liquid outlet port and a liquid storage cavity, the liquid supply port and the liquid outlet port are both connected to the liquid storage cavity, and the liquid supply port and the liquid outlet port are both connected to the cooling cavity.

In one embodiment, the motor assembly includes a heat exchange device disposed on the reducer housing, the heat exchange device is formed with a heat exchange channel configured to flow a heat exchange medium, and the heat exchange channel is located outside the liquid storage chamber.

Beneficial Effects

The embodiment of the present application discloses a motor and a motor assembly, wherein the stator assembly is placed in a cooling chamber where coolant flows, so that the stator assembly can be immersed in the coolant, so that the coolant and the stator assembly are in full contact and heat exchange is performed, thereby improving the heat exchange efficiency, so as to improve the cooling uniformity of the stator assembly, thereby allowing the motor to dissipate heat in time during operation, and improving the service life and working stability of the motor. On the other hand, the cooling chamber and the accommodating chamber are independent of each other, so that the coolant in the cooling chamber can be prevented from leaking onto the rotor assembly and colliding with it, thereby avoiding affecting the mechanical efficiency of the rotor assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a cross-sectional schematic diagram of a motor assembly provided in an embodiment of the present application;

FIG2 is a schematic structural diagram of the stator assembly in FIG1 ;

FIG3 is a schematic diagram of the structure of the oil retaining ring and the sealing ring in FIG1 ;

FIG4 is a schematic structural diagram of the mounting slot of the rotor core;

FIG5 is a schematic cross-sectional view of the accelerator housing and the heat exchange device.

Description of Reference Numerals

Motor assembly 100; motor 1; housing 11; cooling chamber 11a; first chamber 11a1; second chamber 11a2; accommodating chamber 11b; liquid inlet 11c; first branch 11d; second branch 11e; motor housing 111; first chamber 111a; second chamber 111b; motor end cover 112; first groove 112a; stator assembly 12; stator core 121; liquid passage 121a; mounting groove 121b; stator winding 122; rotor assembly 13; rotating shaft 131; shaft end 1311; flow hole 1311a; first flow channel 1311a1; second flow channel 1311a2; first shaft end 13111; second shaft end 1 3112; rotor core 132; weight-reducing through hole 132a; end plate 133; cooling channel 14; liquid guide groove 14a; reducer 2; reducer housing 21; liquid delivery port 21a; liquid outlet 21b; liquid storage chamber 21c; first housing 211; second groove 211a; second housing 212; reducer first shaft 22; axial flow channel 22a; radial flow channel 22b; oil deflector 3; mounting foot 3a; limiting groove 3b; first oil deflector 31; second oil deflector 32; heat exchange device 4; heat exchange channel 4a; heat exchange plate 41; first heat exchange column 411; second heat exchange column 412; water-cooled cover plate 42; water inlet 42a; water outlet 42b; sealing ring 5.

Embodiments of the present invention

It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The descriptions of "first", "second", etc. in the embodiments of the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

In the related art, if the stator assembly is cooled by spraying coolant on it, uneven spraying is likely to occur, and some areas of the stator assembly are difficult to contact with the coolant, resulting in uneven cooling of the stator assembly.

On the one hand, an embodiment of the present application provides a motor, referring to Figures 1 to 5, the motor 1 includes a housing 11, a stator assembly 12 and a rotor assembly 13. The housing 11 is formed with a cooling cavity 11a and a receiving cavity 11b which are independent of each other, and the cooling cavity 11a is used to circulate coolant.

The housing 11 is formed with a drain port connected to the cooling chamber 11a. After the heat exchange of the coolant is completed, it can flow out from the drain port to avoid the accumulation of heat in the coolant and affect the subsequent cooling of the coolant.

The cooling chamber 11a and the accommodating chamber 11b are independent of each other, which means that the cooling chamber 11a and the accommodating chamber 11b are not connected to each other, that is, the cooling liquid cannot flow between the cooling chamber 11a and the accommodating chamber 11b.

The stator assembly 12 is located in the cooling chamber 11 a ; the rotor assembly 13 is rotatably disposed in the accommodating chamber 11 b .

The motor 1 provided in the embodiment of the present application places the stator assembly 12 in a cooling chamber 11a in which coolant flows, so that the stator assembly 12 can be immersed in the coolant, so that the coolant and the stator assembly 12 are in full contact and heat exchange is performed, thereby improving the heat exchange efficiency and improving the cooling uniformity of the stator assembly 12, so that the motor 1 can dissipate heat in time during operation, thereby improving the service life and working stability of the motor 1. On the other hand, the cooling chamber 11a and the accommodating chamber 11b are independent of each other, so that the coolant in the cooling chamber 11a can be prevented from leaking onto the rotor assembly 13 and colliding with it, thereby avoiding affecting the mechanical efficiency of the rotor assembly 13.

Exemplarily, in one embodiment, the motor 1 may be a permanent magnet synchronous motor 1 .

Exemplarily, in one embodiment, the coolant may be cooling oil or the like.

In one embodiment, the cooling cavity 11a surrounds the outer periphery of the accommodating cavity 11b. For example, the cooling cavity 11a is an annular cavity. In this way, on the one hand, all parts of the entire stator assembly 12 can be located in the cooling cavity 11a, increasing the heat exchange area and improving the cooling effect of the stator assembly 12; on the other hand, the risk of the coolant in the cooling cavity 11a leaking into the accommodating cavity 11b can be reduced.

In one embodiment, referring to FIG. 1 and FIG. 2 , the stator assembly 12 includes a stator core 121 and a stator winding 122. The stator core 121 is formed with winding slots that penetrate through both end surfaces along the axial direction, and a portion of the stator winding 122 is disposed in the winding slots. Here, the coolant can flow into the winding slots to fill between the metal wires of the stator winding 122, fully contact the stator winding 122 for heat exchange, and avoid the generation of a contact blind area. In this way, not only can the stator winding 122 be cooled evenly, but also the cooling effect can be enhanced.

It should be noted that the stator winding 122 is arranged in the stator core 121 to form an electromagnetic circuit, generate a rotating magnetic field, and drive the rotor assembly 13 to rotate. Therefore, the stator winding 122 is the largest heat source and needs to be cooled to ensure stable operation of the motor 1.

In one embodiment, referring to FIG. 1 , the inner circumference of the stator core 121 abuts against the inner circumference of the cooling cavity 11a, and the outer circumference of the stator core 121 abuts against the outer circumference of the cooling cavity 11a. Here, the inner circumference of the stator core 121 abuts against the inner circumference of the cooling cavity 11a in the radial direction, and the outer circumference of the stator core 121 abuts against the outer circumference of the cooling cavity 11a in the radial direction, so as to divide the cooling cavity 11a into a first cavity 11a1 and a second cavity 11a2, and the two ends of the stator winding 122 in the axial direction are respectively located in the first cavity 11a1 and the second cavity 11a2, so as to be fully cooled.

The outer circumference of the stator core 121 is formed with a liquid-passing groove 121a that passes through both ends of the axial direction. The outer circumference of the stator core 121 is formed with the liquid-passing groove 121a that passes through both ends of the axial direction, so that the first cavity 11a1 and the second cavity 11a2 can be connected. In this way, when the cooling liquid in the first cavity 11a1 passes through the liquid-passing groove 121a, it can fully contact the outer circumference of the stator core 121, and can be directly cooled. Moreover, since the stator winding 122 is in contact with the stator core 121, the stator winding 122 can be indirectly cooled, and the temperature of the stator winding 122 is further reduced to ensure its stable operation.

In one embodiment, referring to FIG. 1 , the motor 1 includes a cooling channel 14 for circulating coolant, and the cooling channel 14 runs through two opposite ends of the rotor assembly 13. Thus, on the one hand, the coolant circulating in the cooling channel 14 can directly cool the rotor assembly 13 to improve the working stability of the rotor assembly 13; on the other hand, the coolant enters from one opposite end of the cooling channel 14, and after heat exchange, flows out from the other opposite end of the cooling channel 14. Thus, the coolant can be prevented from being thrown out of the cooling channel 14 during the operation of the rotor assembly 13 to cause mechanical losses, thereby improving the efficiency of the motor 1.

In one embodiment, referring to FIG. 1 , the housing 11 is formed with a liquid inlet 11c, a first branch 11d, and a second branch 11e. The first branch 11d connects the liquid inlet 11c and the cooling chamber 11a, and the second branch 11e connects the liquid inlet 11c and the cooling channel 14. Exemplarily, the coolant enters from the liquid inlet 11c and is then divided into two paths, one path enters the cooling chamber 11a through the first branch 11d to cool the stator assembly 12; the other path enters the cooling channel 14 through the second branch 11e to cool the rotor assembly 13. In this way, the coolant replenishment of the first branch 11d and the second branch 11e can be realized through one liquid inlet 11c, which can reduce the opening of the liquid inlet 11c and reduce the difficulty of oil circuit design.

Exemplarily, the flow cross section area of the first branch 11d is larger than the flow cross section area of the second branch 11e. Thus, the flow rate of the coolant in the first branch 11d is larger than the flow rate of the coolant in the second branch 11e, so as to increase the cooling of the stator assembly 12.

In some embodiments, the housing 11 is formed with two liquid supply ports, one of which is communicated with the first branch 11 d , and the other of which is communicated with the second branch 11 e .

In one embodiment, referring to FIG. 1 , the rotor assembly 13 includes a rotating shaft 131 and a rotor core 132. The rotor core 132 is sleeved on the rotating shaft 131. The rotor core 132 is formed with weight-reducing through holes 132a penetrating both axial end surfaces thereof. The weight-reducing through holes 132a are part of the cooling channel 14. In this way, the original weight-reducing through holes 132a of the rotor core 132 are used to circulate the cooling liquid, which reduces the modification of the structure of the rotor core 132, and reduces the design and manufacturing costs. When the cooling liquid passes through the weight-reducing through holes 132a, it can fully contact the rotor core 132 for heat exchange, so as to directly cool it and reduce the temperature of the rotor core 132. Moreover, since the rotor core 132 is sleeved on the rotating shaft 131, the rotating shaft 131 can be indirectly cooled, thereby improving the working stability of the rotating shaft 131.

In one embodiment, please refer to FIG. 1 , the rotor assembly 13 includes two end plates 133, which are sleeved outside the rotating shaft 131 and respectively abut against two axial end faces of the rotor core 132. In this way, on the one hand, the rotor core 132 can be axially limited to prevent the rotor core 132 from axially moving during the rotation process, thereby improving the rotation stability of the rotor core 132; on the other hand, by axially abutting against the end face of the rotor core 132, the end strength of the rotor core 132 can be increased, thereby preventing the punching sheets on the end of the rotor core 132 from warping and spreading, thereby affecting the magnetic flux density and magnetic flux intensity.

At least one of the end faces of the end plate 133 and the rotor core 132 facing each other is formed with a liquid guide groove 14a, which is a part of the cooling channel 14, and the weight-reducing through hole 132a communicates with the two liquid guide grooves 14a located on both sides of the axial direction. Exemplarily, each end plate 133 is formed with a groove on the end face close to the rotor core 132, and the notch of the groove faces the rotor core 132, and the end plate 133 abuts against the end face of the rotor core 132 to form a liquid guide groove 14a by axially closing the notch of the groove, that is, the liquid guide groove 14a extends radially to cover as much of the end face of the rotor core 132 as possible to cool the end face of the rotor core 132, so that the coolant can enter the weight-reducing through hole 132a through the liquid guide groove 14a on one side to cool the rotor core 132 axially, and then flow into the heat conduction groove on the other side to continue cooling the other side end face of the rotor core 132.

In one embodiment, referring to FIG. 1 , the rotating shaft 131 has two shaft ends 1311 located at two ends of the rotor core 132 along the axial direction. Exemplarily, the two shaft ends 1311 are divided into a first shaft end 13111 and a second shaft end 13112. The shaft end 1311 is formed with a flow hole 1311a, and the flow hole 1311a is connected to the liquid guide groove 14a on the side where the shaft end 1311 is located. Exemplarily, taking the first shaft end 13111 as an example, the flow hole 1311a includes a first flow channel 1311a1 and a second flow channel 1311a2 which are interconnected. The first flow channel 1311a1 passes through an end face of the rotating shaft 131 and then extends axially. A second flow channel 1311a2 is arranged near the end of the first flow channel 1311a1. The second flow channel 1311a2 passes through the rotating shaft 131 radially. The second flow channel 1311a2 is connected to the liquid guide groove 14a. In this way, the coolant can first flow axially through the first flow channel 1311a1 to cool the rotating shaft 131 axially, and then flow into the vicinity of the end of the first flow channel 1311a1 and then enter the second flow channel 1311a2 to cool the rotating shaft 131 radially. After flowing into the end of the second flow channel 1311a2, it then enters the liquid guide groove 14a to cool the rotor core 132. The route of the coolant is: liquid inlet 11c-second branch 11e-first flow channel 1311a1 of the first shaft end 13111-second flow channel 1311a2 of the first shaft end 13111-liquid guide groove 14a on one side of the rotor core 132-weight reduction through hole 132a-liquid guide groove 14a on the other side of the rotor core 132-second flow channel 1311a2 of the second shaft end 13112-first flow channel 1311a1 of the second shaft end 13112. In this way, on the one hand, the heat conduction path can be lengthened and the cooling effect can be enhanced; on the other hand, since the coolant is always circulated in the rotor assembly 13 and is not thrown out of the rotor assembly 13, the loss of mechanical efficiency of the rotor assembly 13 can be reduced.

In one embodiment, the rotor assembly 13 includes a magnetic steel, and a magnetic steel groove is formed on the rotor core 132, and the magnetic steel is arranged in the magnetic steel groove. Exemplarily, a plurality of magnetic steel grooves are opened on the end surface of the rotor core 132, and each magnetic steel groove is provided with a magnetic steel. The magnetic steel groove is connected to the liquid guide groove 14a. Exemplarily, the notch of the magnetic steel groove faces the liquid guide groove 14a, so that the coolant can enter the magnetic steel groove from the liquid guide groove 14a, so that the coolant is fully in contact with the magnetic steel, the heat exchange area is increased, and the cooling effect is improved.

It should be noted that the magnetic field generated by the stator assembly 12 and the magnetic field generated by the magnetic steel exert force on each other, thereby driving the rotor assembly 13 to rotate. Therefore, the magnetic steel is also an important heat source and needs to be cooled to ensure the stable operation of the motor 1.

On the other hand, the embodiment of the present application provides a motor assembly 100, as shown in FIG1, including a reducer 2 and a motor 1 in any one of the above embodiments. The reducer 2 includes a reducer housing 21, which is a part of the housing 11. In this way, by using the reducer housing 21 as a part of the housing 11, the manufacturing cost of the motor assembly 100 can be reduced.

In one embodiment, please refer to Figure 1, the housing 11 includes a motor housing 111 and a motor end cover 112, the motor housing 111 is formed with a first bin 111a and a second bin 111b that are independent of each other, the first bin 111a and the second bin 111b are open at both ends along the axial direction, and the reducer housing 21 and the motor end cover 112 are respectively located at the two ends of the motor housing 111 along the axial direction.

The first chamber 111a and the second chamber 111b are independent of each other, which means that the first chamber 111a and the second chamber 111b are not connected to each other. In other words, the coolant cannot flow between the first chamber 111a and the second chamber 111b

For example, please refer to FIG1 , the side of the reducer housing 21 close to the motor 1 in the axial direction is the first housing 211, and the side of the reducer housing 21 away from the motor 1 is the second housing 212. The first housing 211 and the motor end cover 112 are respectively provided to cover the openings at both ends of the first bin 111a and the second bin 111b in the axial direction. In this way, by using the reducer housing 21 as the end cover part of the motor housing 111, on the one hand, the manufacturing cost of the motor 1 can be reduced; on the other hand, the end strength of the motor 1 can be improved.

The reducer housing 21 and the motor end cover 112 close the openings at both ends of the first chamber 111a along the axial direction to jointly define the cooling chamber 11a. Exemplarily, the motor end cover 112 is formed with a first groove 112a opening toward the first housing 211, and the first housing 211 is formed with a second groove 211a opening toward the motor end cover 112. The groove walls of the first groove 112a and the second groove 211a on one side away from the rotating shaft 131 are connected to the motor housing 111, and the groove walls of the first groove 112a and the second groove 211a on the other side are connected to the rotating shaft 131 through a bearing, that is, the first shaft end 13111 and the second shaft end 13112 are connected to the groove walls of the first groove 112a and the second groove 211a through a bearing to achieve relative rotation of the rotating shaft 131 and the housing 11. Please refer to Figures 1, 3 and 4. The motor assembly 100 includes an oil deflector 3. The number of the oil deflector 3 is two. The two oil deflectors 3 are divided into a first oil deflector 31 and a second oil deflector 32. The first oil deflector 31 and the second oil deflector 32 are respectively arranged on both sides of the first chamber 111a along the axial direction. Taking the first oil deflector 31 as an example, a side surface of the first oil deflector 31 is formed with a plurality of mounting feet 3a along the circumferential direction. The shape of the mounting feet 3a is not limited, for example, it can be a trapezoidal shape; a mounting groove is formed on the end surface of the stator core 121 121b, the slot of the mounting groove 121b is an inverted "eight" shape, so that the mounting foot 3a can be inserted into the mounting groove 121b to complete the fixation of the stator core 121, and the other side of the first oil deflector ring 31 is embedded in the bottom surface of the first groove 112a, so that the outer circumferential wall of the first oil deflector ring 31, the outer circumferential wall of the second oil deflector ring 32, the bottom surface of the first groove 112a, the bottom surface of the second groove 211a and the inner wall of the motor housing 111 along the radial direction together define the cooling chamber 11a.

The reducer housing 21 and the motor end cover 112 close the openings at both ends of the second chamber 111b in the axial direction to define the accommodating chamber 11b together. In this way, the inner wall of the first housing 211, the inner wall of the motor end cover 112, the inner circumferential surface of the first oil deflector 31 and the inner circumferential surface of the second oil deflector 32 together define the accommodating chamber 11b.

Exemplarily, a liquid inlet 11 c , a first branch 11 d , and a second branch 11 e are formed on the motor end cover 112 .

In one embodiment, please refer to FIG. 1 and FIG. 5 , the reducer housing 21 is formed with a liquid delivery port 21a, a liquid outlet 21b and a liquid storage chamber 21c, the liquid delivery port 21a and the liquid outlet 21b are both connected to the liquid storage chamber 21c, the liquid delivery port 21a is connected to the liquid discharge port, and the liquid outlet 21b is connected to the cooling chamber 11a. Exemplarily, the first housing 211 is formed with a liquid discharge port on the side close to the second cavity 11a2, the first housing 211 is formed with a liquid delivery port 21a on the side away from the second cavity 11a2, the liquid delivery port 21a is connected to the liquid discharge port, the bottom of the reducer housing 21 is formed with a liquid storage chamber 21c and a liquid outlet 21b, the liquid outlet 21b is connected to the liquid storage chamber 21c, and the liquid outlet 21b is connected to the cooling chamber 11a, so that after the coolant completes the heat exchange in the oil storage chamber 21, it can flow into the cooling chamber 11a to cool the stator assembly 12. The cooling oil route of the stator assembly 12 is: liquid inlet 11c - first branch 11d - first cavity 11a1 - winding slots, gaps between copper wires of the stator winding 122 and/or liquid passages 121a - second cavity 11a2 - liquid discharge port - liquid delivery port 21a - liquid storage chamber 21c - liquid outlet 21b.

Exemplarily, in one embodiment, please refer to FIG. 1 , the reducer 2 includes a first reducer shaft 22, the first reducer shaft 22 extends in the circumferential direction, one end of the first reducer shaft 22 is connected to the rotating shaft 131, an axial flow channel 22a running through the axial direction of the first reducer shaft 22 is formed, the axial flow channel 22a is connected to the first flow channel 1311a1 of the second shaft end 13112, a radial flow channel 22b is formed between the first reducer shaft 22 and the inner wall of the second housing 212, the axial flow channel 22a is connected to the radial flow channel 22b, and the radial flow channel 22b is connected to the liquid storage chamber 21c. The cooling liquid route of the rotor assembly 13 is as follows: liquid inlet 11c-second branch 11e-first flow channel 1311a1 of the first shaft end 13111-second flow channel 1311a2 of the first shaft end 13111-liquid guide groove 14a on one side of the rotor core 132-weight reduction through hole 132a-liquid guide groove 14a on the other side of the rotor core 132-second flow channel 1311a2 of the second shaft end 13112-first flow channel 1311a1 of the second shaft end 13112-axial flow channel 22a-radial flow channel 22b-liquid storage chamber 21c-liquid outlet 21b.

In some embodiments, please refer to Figure 3, the motor assembly 100 includes a sealing ring 5, and a limiting groove 3b is formed on a side of the oil deflector 3 away from the mounting foot 3a, and the sealing ring 5 is located in the limiting groove 3b. In this way, the coolant in the cooling chamber 11a can be prevented from leaking out from the gap between the first oil deflector 31 and the bottom surface of the first groove 112a, and the gap between the second oil deflector 32 and the bottom surface of the second groove 211a, thereby preventing the coolant from colliding with the rotor assembly 13 and affecting the mechanical efficiency.

In one embodiment, referring to FIG5 , the motor assembly 100 includes a heat exchange device 4 disposed on the reducer housing 21 , the heat exchange device 4 is formed with a heat exchange channel 4a for circulating a heat exchange medium, and the heat exchange channel 4a is located outside the liquid storage chamber 21c. The heat exchange medium is used to exchange heat with the coolant.

For example, in one embodiment, please refer to FIG. 5 , the heat exchange device 4 includes a heat exchange plate 41 and a water-cooled cover plate 42, which are arranged at intervals in the up-down direction to define a heat exchange channel 4a, and the upper portion of the heat exchange plate 41 is a liquid storage chamber 21c. In other words, the coolant in the liquid storage chamber 21c is in direct contact with the heat exchange plate 41, so that the heat exchange medium in the heat exchange channel 4a can exchange heat with the coolant in the liquid storage chamber 21c through the heat exchange plate 41, and take away the heat of the coolant.

Exemplarily, in one embodiment, please refer to Figure 5, a water inlet 42a and a water outlet 42b are formed on the water-cooled cover plate 42, and the water inlet 42a and the water outlet 42b are both connected to the heat exchange channel 4a, that is, the heat exchange medium can enter the heat exchange channel 4a from the water inlet 42a to exchange heat with the coolant in the liquid storage chamber 21c, and then flow out of the heat exchange channel 4a from the water outlet 42b. In this way, the heat exchange medium can be continuously replenished to more fully exchange heat with the coolant, and the heat exchange effect is good.

Exemplarily, in one embodiment, please refer to Figure 5, the portion of the end surface of the heat exchange plate 41 close to the liquid storage chamber 21c protrudes toward the liquid storage chamber 21c to form a first heat exchange column 411, and the portion of the end surface of the heat exchange plate 41 close to the heat exchange channel 4a protrudes toward the heat exchange channel 4a to form a second heat exchange column 412. The first heat exchange column 411 is connected to the second heat exchange column 412, that is, the coolant can enter the second heat exchange column 412 from the first heat exchange column 411. In this way, the contact area between the coolant and the heat exchange medium can be increased, the heat exchange area can be increased, and the heat exchange effect can be improved.

Exemplarily, in one embodiment, the motor assembly 100 includes an oil pump device, which connects the liquid outlet 21b and the liquid inlet 11c, so that the oil pump device can pump the coolant after heat exchange from the liquid outlet 21b to the liquid inlet 11c to continuously cool the stator assembly 12 and the rotor assembly 13.

In one embodiment, the motor assembly 100 includes a motor 1 controller, which is used to control the speed and torque of the motor 1, as well as control the output voltage and output current to the motor 1, and at the same time read the data of the temperature sensor on the motor 1 to limit the temperature of the motor 1. When the temperature of the motor 1 exceeds the temperature limit, the power and torque of the motor 1 will be limited.

The above is only an optional embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. All modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present application are included in the protection scope of the present application.

Claims

A motor, comprising:

The housing is formed with a cooling cavity and a receiving cavity which are independent of each other, and the cooling cavity is configured to flow a coolant;

A stator assembly is located in the cooling cavity;

The rotor assembly is rotatably disposed in the accommodating cavity.
The motor according to claim 1, wherein the cooling cavity surrounds the outer circumference of the accommodating cavity.
The motor according to claim 1, wherein the stator assembly comprises a stator core and a stator winding, the stator core is formed with winding slots penetrating through both end surfaces along the axial direction, and a portion of the stator winding is arranged in the winding slots.
The motor according to claim 3, wherein the inner circumferential surface of the stator core abuts against the inner circumferential surface of the cooling cavity, the outer circumferential surface of the stator core abuts against the outer circumferential surface of the cooling cavity, and the outer circumferential surface of the stator core is formed with liquid passing grooves penetrating its two axial end surfaces.
The motor according to claim 1, wherein the motor comprises a cooling channel configured to flow a coolant, the cooling channel passing through opposite ends of the rotor assembly.
The motor according to claim 5, wherein the rotor assembly comprises a rotating shaft and a rotor core, the rotor core is sleeved on the rotating shaft, and the rotor core is formed with weight-reducing through holes penetrating both axial end surfaces thereof, and the weight-reducing through holes are part of the cooling channel.
The motor according to claim 6, wherein the rotor assembly includes two end plates, the two end plates are sleeved outside the rotating shaft and respectively abut against two axial end faces of the rotor core, at least one of the opposite end faces of the end plate and the rotor core is formed with a liquid guide groove, the liquid guide groove is a part of the cooling channel, and the weight-reducing through hole connects the two liquid guide grooves located on both sides of the axial direction thereof.
The motor according to claim 7, wherein the rotating shaft has two shaft ends located at two ends of the rotor core along the axial direction, and the shaft ends are formed with flow holes, and the flow holes are connected to the liquid guide groove on the side where the shaft ends are located.
The motor according to claim 7, wherein the rotor assembly includes a magnetic steel, a magnetic steel groove is formed on the rotor core, the magnetic steel is arranged in the magnetic steel groove, and the magnetic steel groove is connected to the liquid guide groove.
The motor according to claim 5, wherein the housing is formed with a liquid inlet, a first branch and a second branch, the first branch connecting the liquid inlet and the cooling cavity, and the second branch connecting the liquid inlet and the cooling channel.
A motor assembly, comprising:

A motor as claimed in any one of claims 1 to 10;

The reducer comprises a reducer housing, wherein the reducer housing is a part of the housing.
The motor assembly according to claim 11, wherein the housing comprises a motor housing and a motor end cover, the motor housing is formed with a first bin and a second bin which are independent of each other, the first bin and the second bin are open at both ends along the axial direction, and the reducer housing and the motor end cover are respectively located at both ends of the motor housing along the axial direction;

The reducer housing and the motor end cover close the openings at both ends of the first chamber along the axial direction to jointly define the cooling cavity;

The reducer housing and the motor end cover close the openings at both ends of the second chamber along the axial direction to jointly define the accommodating cavity.
The motor assembly according to claim 11, wherein the reducer housing is formed with a liquid supply port, a liquid outlet and a liquid storage cavity, the liquid supply port and the liquid outlet are both connected to the liquid storage cavity, and the liquid supply port and the liquid outlet are both connected to the cooling cavity.
The motor assembly according to claim 13, wherein the motor assembly includes a heat exchange device arranged on the reducer housing, the heat exchange device is formed with a heat exchange channel configured to circulate a heat exchange medium, and the heat exchange channel is located outside the liquid storage chamber.